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bh=bB5ASdAOKRlBSjf6eEIPEh+eRCucZRp3Y42SIxEk/kQ=; b=9V1oGtxMvGaDmOwh+O4SkL2zkT0WBZi0eiYuwBcYCSDLlpwOBipMKIV7CTR06GpO7iakyd RwnzxRzMm9o4faDA== From: "tip-bot2 for Costa Shulyupin" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: timers/core] hrtimer: Select housekeeping CPU during migration Cc: Waiman Long , Costa Shulyupin , Thomas Gleixner , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20240222200856.569036-1-costa.shul@redhat.com> References: <20240222200856.569036-1-costa.shul@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <170863704606.398.1106798877548525205.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Precedence: bulk X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1791635861864105113 X-GMAIL-MSGID: 1791635861864105113 The following commit has been merged into the timers/core branch of tip: Commit-ID: 56c2cb10120894be40c40a9bf0ce798da14c50f6 Gitweb: https://git.kernel.org/tip/56c2cb10120894be40c40a9bf0ce798da14c50f6 Author: Costa Shulyupin AuthorDate: Thu, 22 Feb 2024 22:08:56 +02:00 Committer: Thomas Gleixner CommitterDate: Thu, 22 Feb 2024 22:18:21 +01:00 hrtimer: Select housekeeping CPU during migration During CPU-down hotplug, hrtimers may migrate to isolated CPUs, compromising CPU isolation. Address this issue by masking valid CPUs for hrtimers using housekeeping_cpumask(HK_TYPE_TIMER). Suggested-by: Waiman Long Signed-off-by: Costa Shulyupin Signed-off-by: Thomas Gleixner Reviewed-by: Waiman Long Link: https://lore.kernel.org/r/20240222200856.569036-1-costa.shul@redhat.com --- kernel/time/hrtimer.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c index 5a98b35..1fd106a 100644 --- a/kernel/time/hrtimer.c +++ b/kernel/time/hrtimer.c @@ -38,6 +38,7 @@ #include #include #include +#include #include #include #include @@ -2225,8 +2226,8 @@ static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base, int hrtimers_cpu_dying(unsigned int dying_cpu) { + int i, ncpu = cpumask_any_and(cpu_active_mask, housekeeping_cpumask(HK_TYPE_TIMER)); struct hrtimer_cpu_base *old_base, *new_base; - int i, ncpu = cpumask_first(cpu_active_mask); tick_cancel_sched_timer(dying_cpu);